Being on the inside having to deal with the processing of work, it sure is a pain when the crew did not get the proper information on the check. Even if it's as simple as the completed work order reading $159.95 and the check written for $160.00. When they happen with small amounts, we just change the work order to match. When it's larger amounts, we have to do one or more of the following: questions the crew, contact the customer, refund an over payment, bill for a shorted amount, etc. The same when dealing with cash. I always suggest to count the cash and laugh it off as making sure the customer didn't make a mistake and pay too much.
Even as an owner operator, the numbers need to match and there is no disrespect when you are confirming the information on the check.
Right or wrong, I have signed the customer's signature on the check when they have forgotten to sign it. I have done it at least a dozen times over the years and it has never come back to bite me. (knock on wood)