To a guy that spent a lifetime in junkyards and photoing Mustangs.................things like finding heater deletes, radio delete or export DSO etc etc must have been "the greatest day" !!
Since the 80's at least it was always a combination of looking for parts needed and ones I could sell at swap meets or friends to pay for my hobby.
With the beginning of digital pictures I had to slow down to capture what I was seeing along with the other stuff. Overtime my focus switched from one area to another depending on the need at the time (always including unibody details though) but I realized I was so blessed with the access I had and that continuous nagging reminder that if I didn't capture what I was seeing at that moment, I would never get the opportunity again.
Then over time it became trips for solely (unless I ran across a really neat part) getting pictures and details to further research or help with someones need on-line. Some times this produced some very funny looks from yard workers and owners. Like the one day I spent a couple of hours cleaning (yes soap, brushes and ten gallons of water I brought with me) to scrub a nice pair of Dearborn front wheel wells in a yard.
The good thing is that over the years of repeated visits many of the owners got use to the odd guy that just took picture. Though I always tried to buy some things especially during the times when things we're going well. Fully understanding that unless the business was health and open I had no access.
I also choose on most occasions that I always doubled what ever they were asking for gallon or so of little odd pieces of clips and hardware I would take home and that no one else was interested in. The major thing was developing a talent of getting past the front counter into the yard alone and trusted. If that couldn't be worked out or I couldn't bore whomever went with me within 30 mins or so - so be it. I still got my pictures and a look
Had one owner that sent his pregnant daughter out to watch me in 100 degree or greater heat one day
Yes you have to stay with it and check every possible vehicle. Recall 68 1/2 starter delay from a station wagon, export brace from a Falcon and so on. Bottom line - great education and opportunities along with everything I was doing locally, nationally and at home.
Oh the fun of the hunt