The 240 figure was as of 08:00 CST, July 20, according to the Voluntary Bridge to Retirement page on Jetnet. Surely there have been a few additional requests since then.
The proffer has been open for a long time now. Realistically, how many do you suppose were jumping on it at the last minute? My guess is not many.
The only thing I can see people wanting at the last minute was to hold partnership flying. From what I understand (through what people have told me) the partnership flying goes by the highest seniority, you can fly however many days you want if the other person agrees, and if they are not on reserve than neither are you. THAT alone is priceless.