NASCAR Diecast Collectables Question

SO, I ended up in a second hand store and they had all these diecasts. When the guy told me they were 1/2 price I may have gotten a bit crazy.
Any of you have better resources than I to tell me if I found anything fantastic?

Mark Martin #6 2000 Ford Taurus (Eagle One paint sceme) limited edition one of 20004
in box with certificate, styrofoam and tissue paper 1:24 scale

Mark Martin #6 2000 Ford Taurus (Valvoline/ Zerex paint sceme) limited edition one of 20016
in box with certificate, styrofoam and tissue paper 1:24 scale

Dale Jarrett #88 1998 Ford Taurus (Quality Care paint sceme)limited edition one of 5000 (bank)
in box with , styrofoam and tissue paper 1:24 scale

Tony Stewart #20 1998 or 99 (box says 99 styrofoam liner says 98) Pontiac (Home Depot/ Habitat for Humanity paint) one of 10008
in box with styrofoam. box is 'sleeved' 1:18 scale

Bobby Hamilton #43 Pontiac (STP paint)
Richard Petty STP 25th anniversary
in display type box -has 'viewing window' it is on a base. 1:18 scale
not much info on the box and I'm not opening it.

Ricky Rudd #10 Thunderbird (Tide paint)
in display type box -has 'viewing window' it is on a base. 1:18 scale
not much info on the box and I'm not opening it.

If you know anything about these "toys" I would love the info.
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