A package arrived by post addressed to me which I have just opened. It is my OH's (very generous) christmas present to me, but because of the nature of what it is the seller has used my name as the addressee and I can sort of understand how it has happened. My problem is that it is a complete surprise and I know OH would be gutted if he though I knew what it was ahead of christmas day. 
I can't put the genie back in the bottle. What on earth should I do?