Looks like your #11 did not come back as MS-70?
Well just a suggestion, make up your mind on the price that you wanna sell (USD or BTC) and respond to people on for accepting/rejecting/counteroffer promptly. And yes the the offers do expire, if someone makes an offer today based on market rate, it might not be valid after 10 days. So you can't respond to someone after 10 days saying u accept or reject the offer that was made 10-12 days ago..
Well GLWS.