How much would these sell for at auction?

These 3 cards are part of a bigger collection I'm looking at buying and I can't find comparable sales anywhere. A couple are listed on ebay but there isn't any completed listings to look at for them. They are 3 of more valuable cards in the collection so I need some input if anyone has an idea as to what they'd sell for at auction. Thanks
2008 Bowman Chrome Buster Posey Rookie Auto Gold /50 BGS 9.5 (Listed on Ebay with BIN/BO - BGS 9.5 for $2800, PSA 9 for $1800, BGS 9 for $1699)
2006 Bowman Chrome Evan Longoria Rookie Auto Gold /50 BGS 9 (Listed on Ebay with BIN/BO - PSA 9 for $2375, PSA 9 for $1999)
2005 Bowman Chrome Justin Verlander Rookie Auto Gold /50 BGS 9 (Listed on Ebay with BIN/BO - BGS 9.5 for $2500, PSA 9 for $1950)
2008 Bowman Chrome Buster Posey Rookie Auto Gold /50 BGS 9.5 (Listed on Ebay with BIN/BO - BGS 9.5 for $2800, PSA 9 for $1800, BGS 9 for $1699)
2006 Bowman Chrome Evan Longoria Rookie Auto Gold /50 BGS 9 (Listed on Ebay with BIN/BO - PSA 9 for $2375, PSA 9 for $1999)
2005 Bowman Chrome Justin Verlander Rookie Auto Gold /50 BGS 9 (Listed on Ebay with BIN/BO - BGS 9.5 for $2500, PSA 9 for $1950)
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Comments
A BGS 9 sold 5/5/13 on ebay for $745.18 - auction
Ungraded sold 5/18/13 on ebay for $755.35 - auction
Ungraded sold 11/24/13 on ebay for $588 - BIN
Buster Posey
PSA 9 sold for $1100 on 3/5/14 - BIN/BO
PSA 9 sold for $850 on 7/31/13 - BIN
PSA 9 sold for $715.18 on 6/28/13 - Auction
Evan Longoria
BGS 8.5 sold for $455 on 7/28/13 - Auction
Ungraded sold for $620 on 6/12/13 - Auction
These are the only sales on ebay within the last year.