I sent a registered insured package from my local post office to an address 70 miles away on 1-24-25.
It has been back and forth to Boston twice and is now who knows where?

I can beat that, we have a business PO Box at the USPS office, had it for neigh on 20 years, also have a Business Reply account, same USPS office.

On several occasions I've had my mail rejected on an prepaid incoming BRP account, with funds in the account as, "not valid address"

WTF, it's a PO Box INSIDE the USPS office that is rejecting it... sending it back to my clients, who I had put in another BRP envelope, exact same one as the original, no changes or modifications, and it gets delivered

Took it over to the manager who replaced the original, guy actually started to tell me how we did it incorrectly, to which I pointed out, "you guys supply the artwork" AND " this account has been here for 20 years as the POB" AND, heres the other 20 odd pieces of BRP mail that came in today AND here's my BRP envelope that the client used to mail me the BRP envelop you returned to them...

There are a few there I trust, but some are just idiots...

HECK they can't even send text updates right anymore. I sent a package Friday. Came home signed up for updates on the progress of the package. i have not received one.
Tracked it just before i came to SF it is in the PO box i sent it to