This is the same scam recycled - in a couple of days you will get an email asking for some of the money to be returned for some reason, they will want to cancel part of the furniture, or need some of the money back for some spurious reason, so will ask you to transfer some of the money back by Western Union once the cheque has cleared.
You send the money out of your account as the cheque looks like it has cleared, but of course it has not because it is STG cheque it will look like the money is in your account, but when it turns out to be a fraud, bank debits your account a month or so later - and your money is long gone.
I would not even bother lodging the cheque at all, or at least do what BM has said, but to be honest, I would put the cheque in the fire and move on. out of curiousity wait and see exactly what the instructions are.
See if it involves the good old western union scam.