You could post in the forums (like you did), which will get more people to look at your shelf.  You can also make offers to other boxers who have books you want.  You will probably get some turn downs, which you shouldn't take personally, but I'm sure you'll also get an acceptance or two.  I turn boxing on only occasionally, but I know that I have found books I wanted on shelves with 15 books and nothing I wanted on a shelf of 300.

I have my BOB on hold right now but I've never had more than 50 books posted and usually it's only 20-30.  Usually because I'm posting WL books or books that are just ordered quickly.  I still did quite a few BOB trades.  That's actually why I went on hold because I need to move more books out then what's coming into the house.  I'll probably unhold it when I managed get more of my TBR read. 

you actually have 3 books i want!!!

try and see if freecycle is active in your area- then beg for books there- i have fount that to be fairly good when i first joined... got lots of books i wanter to read- then i posted what was left!!! win win win

heee heee  thanks for advice!!

Well the only problem with BOB and posting a bunch of books you haven't read is: then you get offers with people having mostly those type of books on their shelf.  So don't go out and buy a bunch of cheap books you would never read and post them just to have a bigger shelf-unless you like them and want BOB offers from other people with romance, mysteries, fantasy or whatever.  Some people have varied shelves but many people do not. 

I had bought a box of series romances from Ebay and decided I didn't like them.  I posted them all on here and when I first joined BOB all I got was offers to exchange them for more of those little series romances.  I finally ran a 3 for 1 deal and got rid of a bunch of them. I just wanted to point out that what you have on your shelf attracts the BOB offer of people who have similar books. So if you have no interest in them you'll be turning a lot of offers down.