I'd have to look up about 48 loans (excluding the ones in bankruptcy), and then see if they had a payment after some cutoff date? But we'd expect some payments even with no collection activity, so what exactly would I test for?
Well, since you wouldn't receive any loan payments (whether caused by Prosper or simply fortuitous) had Prosper sold your then-4+month lates in mid-April, I suppose any payments received after April 11 would be properly balanced against the money foregone from the cancelled debt sale. But I guess that would be a big pain, unless it could be automated using the API or data download.
Thinking a bit more ... Its even harder than that. You see I know the set of loans that are 4+ now, and I could look at those and see which have their most recent payment before a certain date, but that isn't exactly the same as those loans that were 4+ late on a certain date (ie the debt sale cutoff date), because loans change state. If a loan were 4+ late on the cutoff date, but then became current, I wouldn't see it.
One could theoretically use the loan status data in the prosper export database, as it shows dates of status changes, but I don't know anybody who is doing that. Proprosper won't let you see that table, for example.
Nah, it's easier than that. Go to
http://www.ericscc.com/lenders/Fred93/loans?sort=13&p=2 for a list of all your loans, sorted by status, starting on the second page which is where your 4+month lates start. Click on the first one (119048), and you can immediately see that it went 4+months late on 2/24/08. Hit Back, and click on the next one (25500). 4+months late on 5/27/08. 133462 on 1/23/08. 110268 on 7/23/08. 7055 on 12/27/07. Etc. That would probably take about 10 minutes to get a list of all your currently 4+month late loans that were 4+months at the beginning of April (or whatever day seems appropriate for cut-off date of the cancelled debt sale (I think Doug may even have posted what the cut-off date was)). Then to see the last payment date, I think you would have to go to your Prosper account page, look at the list of your 4+month lates, and click on the each pertinent loan to see the payment history. A pain, but probably not more than 30 minutes.
What that doesn't get you is any loans that were 4+months late on 4/1/08 (or whenever), but which are less than that (or even current or PIF) now. Somehow I doubt there are too many of those, but to see you would have run down your entire list of loans on Eric's as above (not just the currently 4+month lates) and see which, if any, had 4+month status in the past but not now. More of a pain (considering you have 818 loans), but still perhaps doable (at least it would be very quick for each one. because few of these loans were ever 4+months late).
I also could have sworn that someone used Proprosper around a year ago to generate the numbers of loans that were at one time 4+months late but had improved to a better status. Thus, it would seem that the necessary data and infrastructure is available, although I have no idea how to do it.