Misplaced Promissory Note farming data

Returning after a long layoff, this is my first time playing the new vault content. I'm wondering how rare these Misplaced Promissory Note trinkets are, so I thought I would gather some data to get a rough idea.
Assuming I try farming these trinkets on multiple occasions (not guaranteed), I'll edit this post to consolidate the data.
Consolidated data:
Attempt #1:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 20
- Vaults farmed: 161
- Misplaced Promissory Notes found: 0
Attempt #2:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 21
- Vaults farmed: 20
- Misplaced Promissory Notes found: 0
Attempt #3:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 24
- Vaults farmed: 5
- Misplaced Promissory Notes found: 0
Attempt #4:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 20
- Vaults farmed: 81
- Misplaced Promissory Notes found: 1 (56th Vault)
Attempt #5:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 21
- Vaults farmed: 13
- Misplaced Promissory Notes found: 0
Attempt #6:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 22
- Vaults farmed: 10
- Misplaced Promissory Notes found: 0
Attempt #7:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 20
- Vaults farmed: 12
- Misplaced Promissory Notes found: 0
Attempt #8:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 20
- Vaults farmed: 5
- Misplaced Promissory Notes found: 0

Oof, is it really that bad? If that's the case, this is definitely not worth it...

@Wrench-Wizard: True, it's an okay change from farming FSC.
Probably won't do very many on this gate because of the extra depth. Takes twice as long to reach the ??? level, unless I get lucky with the Deconstruction Zone. Also, fiends.
Attempt #2:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 21
- Vaults farmed: 20
- Misplaced Promissory Notes found: 0

Pretty bad luck with this gate. Only got 5 vaults after 29 runs.
Attempt #3:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 24
- Vaults farmed: 5
- Misplaced Promissory Notes found: 0

Oh man you're a beast doing all these runs keep it up and maybe you can buy a prom note from someone that's lucky.

Haha, thanks. Hopefully there will be another vault at D20 some time soon. It's so much easier to get vaults with only 1 depth to go through.

The current Ruby Lion gate is very good; the best vault gate that I've seen since my return. You have two options: stop after the D20 vault, or continue to Basil and try to hit the extra vault at D24. I'm stopping after the D20 vault. I managed to find one promissory note on my 56th vault from this gate.
Attempt #4:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 20
- Vaults farmed: 81
- Misplaced Promissory Notes found: 1 (56th Vault)

Decent vault on the Emerald Queen gate. I'm not sure how many runs I will do with Easter approaching.
Attempt #5:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 21
- Vaults farmed: 13
- Misplaced Promissory Notes found: 0
Edit: Forgot to update this post after the gate ended. Didn't do many vaults because of Easter.

The Dark Phantom gate has slimes in stratum 5. The vault is at depth 22, so not very fast, but it's easy recipe+vault running.
Attempt #6:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 22
- Vaults farmed: 10
- Misplaced Promissory Notes found: 0

The new Jade Clover gate is great for vault running. The Arena and Lichenous Lair have single paths to the elevator, so you can't take a wrong turn, which is perfect.
Attempt #7:
- Gate Map: Image
- Vault type: Burn Rate
- Vault depth: 20
- Vaults farmed: 12
- Misplaced Promissory Notes found: 0
Another good vault gate appeared at the same time as the Jade Clover, the Silver Titan Gate. Farmed that one for a little bit.
Attempt #8:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 20
- Vaults farmed: 5
- Misplaced Promissory Notes found: 0

The Diamond Sun Gate is good for vault running. The preceding Concrete Jungle levels have a deterministic layout, but moving the totems around every time is kind of annoying.
Attempt #9:
- Gate Map: Image
- Vault type: Toxic Debt
- Vault depth: 20
- Vaults farmed: 6
- Misplaced Promissory Notes found: 0

This is a buffer post, so I don't bump this thread every time I update my farming numbers on the current attempt.
Attempt #1: