He deposited my check on 5/1.

If you did not win a bid, they should have simply returned the cashier's check you provided them or given you a refund if it had already been deposited in their escrow account, unless there was an agreement between you for them to hold it for the next offer.

This is true for syndications, buying a stock, buying a single family home, or depositing money in a bank.  

I’m Also certain you’re the type of landlord who will find every reason to eat up their deposit when they leave. 

If not you can use a bank statement program if you have consistent deposits into your business checking account.  

However, lots of CUs and Locals are requiring you to keep deposits with them if you want a loan - typically around the 10% mark.

Lastly, ask for a tenant estoppel to be signed by all tenants to confirm rent, deposit, ownership of major appliances, etc…Btw, you can argue that all DD info request has not been satisfied thus you can extend your DD period.

I know that in the past all held security deposits needed to be stored in their own dedicated TRUST bank account in Missouri.

It does not need to rain nearby to get a flash flood down a wash, that is why hiking slot canyons requires a knowledgeable permitted guide (definitely a bucket list item). 

Payments are made by the government via direct deposit on the 1st.