I agree with whodey. No more than $1000. But it also depends on the player selection and the collation of the box. Although to me it sounds like the ultimate "let someone else bust that and get what you want off the bay for a fraction of the cost" type of box.
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Collecting: Brett Favre (7,771 unique as of 6/1/2015), Packers, UW Huskies (Shaq Thompson, Shelton, Peters, Kikaha, Sankey, ASJ, Trufant, Locker, Brunell, Dillon, etc.)