Back go the chips addressed to anywhere!

Your envelope shown bears two Forever Stamps which is $1.10 but I think the Non-Machineable rate has also increased recently. It was something like $1.19 before and maybe some pennies higher now. Another reason why I remain leery about sending people chips in #10 envelopes by this method. I know some sellers have success at it and buyers can also save a few bucks. But I just don't know if it's worth the hassle and worry to simply try tossing non-machineable items in the postal collection box and hope for the best.

Heck, I tried mailing a $75 check to pay an invoice by depositing it in a first-class envelope in an outdoor collection box in Las Vegas last November - came back into my account as a $525 debit made payable to some person I never heard of, after being washed (I suppose) and promptly cashed - somewhere.

This advice from the U.S. Postal Inspectors (darn right I contacted them) - don't use mailboxes, at least those out on the street. Mail from within a post office preferably by giving to a clerk. And at that same time, always good to ask the clerk if the postage applied is correct for that class of mailing.

Having said all this, Jerry, the choice whether to sell as per your original contract, ask buyers for the correct amount of shipping costs to make it work, or rescind the sale is yours. Me, I'd probably go with honoring my original quote, but others may think differently.