Your prices for both pieces are much higher than what they sell for. That also goes for your 10B Silver in another thread.
Rough guess for values of your pieces without knowing their condition, and not graded:
2012 1B Brass 1.5BTC
2011 1B S1 Error Brass 3BTC
Silver 10B 20BTC
If any of the above are in bad shape as you mention, then values drop accordingly, especially if the holo has been compromised.
You're free to price them however you wish, but just letting you know.
I tend to agree to mr. bithalo here.
Perhaps the 2012 1B Brass is slightly higher, but really impossible to say without pictures, as Blazedout419 suggest. Many of the error coins was carried around in the pocket or pass around in offices for the lulz. Some of these old brass coins are pretty beaten up, and do not have a high premium. Also if not stored correct, brass gets oxidized pretty bad in just a few years.
About the panda's, it is true that some of the Panda's from specific years are extremely expensive. Especially MS70, since some years only had a handful of them out of thousands of minted coins. Again, it comes down to the quality of the coin.
