That's why I clicked.  Not because I think you don't have them or anything.  I just wanted to see some Casascius Coin pr0n. 

I can't provide too much guidance on the 5 BTC Casascius coin as I have never owned one, but I did sell a brass 1/2 BTC Casascius coin not all that long ago for 0.76 BTC (but there was another coin involved as well so you can say 0.74 BTC as a more accurate price).  That was my offer I couldn't refuse.  I hope that helps guide you on what you may be able to get for these.  Although with so many at once it might be a challenge if you're looking for a quick sale.