This happens in the world of unopened fairly regularly. Lots of times when someone is working on a "project." For example, there was a guy working on putting together a box of 1984 Topps rack packs, with all 24 having Nolan Ryan's base card on top. During his project, the average price of those on ebay and the Facebook groups jumped significantly. He finished, and the prices have subsided a bit. But not completely, because the spectre of "ebay comps" haunts us still. He's no longer in the mix buying them like he was previously, but his move did impact the market price and still is having some echoes. There have also been some folks who focused on particular years, like 1983 or 1975, and their aggressive purchasing has definitely affected the marketplace. Of course, more product always emerges, but I think in the unopened world you can definitely see the outsized impact just one or two collectors can have on the perceived "value" of a particular product.
kevin
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