Ive lost my step dads ice cream van key?

After ive cleaned the van i always put it back in the cupboard but its not their which is strange and if its not there then its in my room on my desk so i know where it is buy its not there either ive looked everywhere but i cant find it i couldve lost it from yesterday morning to this morning i cant ask my step dad as he is asleep cause he works nights and if i ask him he'll go mental if ive lost it!!!!!