You hit the pegs. Are they full? Cards crisp? Yes? Then look to see what treasure might be there. Cards soft? All kinds of mixes represented? Spidey cars mixed in? Move on.
Check the premium pegs. Check the Matchbox pegs. Auto World if they are there. Hidden dump bin? Shipper? Clear? Ok, finish with the 9-packs.
Never leave without looking at the 9-packs. There is always a chance of finding something cool, whether it be a new exclusive, a yet to be released basic, an error, or even a cool variation.
And now that new packs are hitting for the holiday, you really should check. I’ve done well so far: