Not a huge score but I needed a headlight retainer ring for my convertible and thought it was pretty cool to find one for $2 still in the Motorcraft envelope at a small town parts swap and car show!
To be honest I wasn't sure what it was when I first saw the envelope. There were three boxes of Fomoco, Motorcraft and Genuine Ford Parts labeled pieces. I was looking for anything with D3 (1973) or C4 (for my 1964 Galaxie) in the code. I must have spent an hour searching through and opening envelopes and boxes. It was great! Thought I had a real score when I saw a set of $5 boxes with spin on hood lock downs but they were coded C8 (1968) and didn't look anything like the ones on 71-73 cars. Still worked out well for me as my headlight trim ring snapped apart when I was taking parts off for paint so this is a good replacement.