Tax crdit applicable for "failed" adoption?

From reading on the tax credit in the past, there is some wording stating that it applies to any "attempt" at adoption. I have heard from some, that you can use fees paid for agency and bmom expenses if the bmom ended up deciding to parent- is this true? Obviously, we wouldnt have social security number or whatever. For us this year, it doesnt apply, becasue we had the one that DIDNT happen, and than, hooray, one that DID, which was over the 10,000 limit, so we will claim that this year. But, an agency told us that we could carry over the fees (like 2500) from the fallen through placement to next year...does this make sense? Has anyone ever done this?