Prototype Famicom games on Yahoo Auctions

[segacd]

To anyone who is interested, I was browsing Yahoo Auctions and found this guy is selling a bunch of Prototype/"Sample" Famicom games. At 5,000 Yen each, they're too expensive for me but maybe someone on here will be interested (a few are unnamed Namco games...)

http://openuser.auctions.yahoo.co.jp/jp/user/ecoshop0?alocale=0jp&mode=2&apg=8

[senseiman]

Interesting!

I am a bit suspicious about a couple of them though, like this demo model of Hot Scramble seems to be nothing more than a regular copy of that game (worth about 200 yen or so) with the word 見本  (sample) written on it:

http://page13.auctions.yahoo.co.jp/jp/auction/r114305695

Same with this copy of Ninja Kun

http://page8.auctions.yahoo.co.jp/jp/auction/h188679729

[80sFREAK]

From beta-tester/codeveloper? 
Labels looks old/aged, but printed with matrix(?) printer.