I recently had an eBay sale go missing. The guy waiting two weeks (very considerate) just in case. No chips. So I mailed him the replacements plus a couple of "cheap chips"

He phoned to tell me I made a mistake and included extra chips.

Nice guy and I thought the extras would be a gift for his troubles. Everyone is happy... I blame myself for the chips not getting there as promised.

From past history, I may have just mailed them to someone else by accident. I feel like and Andy Roony comment here.

You know, people will always tell you when something doesn't arrive as promised, but almost no one will tell you, if you send them something they didn't order?