The problem with that whole ridiculous story is: Who were the checks made out to? The barn? Then there was no scam.
If Nick didn’t have access to the barn account, then his relationship with the barn is not how he represented it.
To Nick personally? Well, then, we do have people committing fraud. But I don’t think the checks were made to Nick personally.
The whole black mailbox thing is a red herring. It’s not relevant. Either the checks were made to the barn/business, the previous trainer/barn manager or Nick.
No scam.
For the sake of argument, let’s say the checks were made directly to the previous manager. How would that not have been discussed as part of the business arrangement?
My original theory was Nick tried to promote himself as a trainer in the same he promoted himself as a clinician. He signed a contract to lease stalls, thinking he would pay for them with the training income, and when no training income developed, defaulted on the contract.
The actual boarders were probably mystified by the whole thing. The end.