I looked at auctions by someone selling banknotes (but they are everywhere chips included) and this is what I found (this is just ONE seller tonno64), below are a list of what appear to be shills:

Understand that these LOOK suspect- (They may truley be legit)

gasparin69 (1)- 8 feedback all from tonno64
http://cgi2.ebay.com/aw-cgi/eBayISAPI.dll?ViewFeedback&userid=gasparin69

nimis-notes72 (6)- 81 feedback from tonno64
http://cgi2.ebay.com/aw-cgi/eBayISAPI.dll?ViewFeedback&userid=numis-notes72

varlop2003 (3)- 26 feedback from from tonno64
http://cgi2.ebay.com/aw-cgi/eBayISAPI.dll?ViewFeedback&userid=varlop2003

If you look at tonno64's auctions you find these guys throughout his CURRENT auctions too.
http://cgi6.ebay.com/ws/eBayISAPI.dll?ViewSellersOtherItems&userid=tonno64&include=0&since=-1&sort=3&rows=25

This is just one example I found many, again this may be legit but it sure looks funny! These appear to be the aliases of the seller, other shill bidding that would be a lot harder (almosr impossible) to spot would be a friend with lots of different feedbacks shilling for you.

Pete.... this is my "Doghouse" Outside and Inside