Hi sdkid,
ETA: I hadn't noticed that this was regarding a student loan, which is different. So skip the following response and head on down to my second post. This is why I shouldn't post when waking up in the middle of the night. Darn. 
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I'm not sure why you're considering paying this debt if it was included in BK.
Sometimes just the shock of receiving a notice like this shakes you up enough that you consider paying, BUT if the account was included in the BK, it is considered paid. It is illegal for them to attempt to collect the debt from you if your BK was discharged. If you were not able to complete the BK and it was dismissed, that is a different story.
We had one creditor send us a collection letter after our CH 13 BK was discharged. It shook me up a bit, too, to tell you the truth. We did check in with our attorney, who advised us to send a business like and firm letter reminding them that the account was IIB (and the dates), that they were illegally pursuing a collection, and that we would take prompt action if we received additional collection correspondence from them. We put a notation that the letter was cc: to our attorney.
They stopped immediately. It was actually a clerical error (new staff), and I guess we shook them up as much as they had shaken us up.
Nothing like a good jolt of caffeine or a Dunning Notice to get your heart pumping! Just pull out your papers and be absolutely sure (as I guess you already are) that these guys were properly included in the BK, and that the BK was properly completed and discharged.
Best wishes to you!