@petewill Checking back in, have good news & bad news...
Bad News: No go on the 315mHz receivers. But that's because...
Good News: I did some research on the remote since you said you didn't recognize it and was able to find the users manual online:
According to this the RF signal is 2.4ghz (last page of the pdf). However, that being said, am I now SOL in replicating the RF sniffing step with your setup? The only 2.4ghz transceiver I was able to find is this one: