As a irl example, on 09.24.22, I mailed 3 checks due to no card processing available at the payees. 2 had postage stamps and one was postage paid and they went into 2 different slots at the Post Office. The 2 with postage were never cashed nor did they reach the payees. On 11.2.22 a web payment appears on my checking account for an apartment in Houston TX and another smaller payment on 11.4.22 for a deposit of some sort. The checks were stolen by a postal employee and are usually “washed” and in this case the routing number and account number were used as web payments. Probably just sold between fellow criminals. The withdrawals were reversed and I was reimbursed the funds. It is quite a large criminal activity but becoming less so due to checks being used less often.