When I participated in this deal a few months ago, I got both my CompUSA eRebates about a week or two earlier than the TrendNet ones.
I got two rejection notices for the TrendNET (one for each product I bought). I think one of them said I purchased out of the timeframe, and the other said something about an ineligible product.
I called them after a few days inquiring about this, and I was surprised that I got to speak to a live person as quick as I did. I gave him my case refernce numbers that were on the rejection slips, and he pulled up my info. When I asked about the ineligible item, he said that was an error (I had the serial number and other info handy).
For the other issue, the rep said that the date I printed the online receipt was after the rebate period, and I pointed out that I printed the receipt after I received the shipment, which was a week after I ordered online (and after the rebate expired). The purchase date was within the time frame, and the rep acknowledged this and stated that the rebates would come in another 3-4 weeks.
I did not have to send in any paperwork after the phone call, and the rebates did show up in about 4 weeks.
Therefore, for the folks who are getting rejections for TrendNet rebates, I encourage you to give them a call. I guess they were assuming you'd forget about the rebates and won't bother to follow up.