Mislay
/ˌmɪsˈleɪ/
Definition 1 of 1
Pro Tip 1/3Temporary Situation
The word 'mislay' indicates that the item is lost for now, but might be found later. 
She mislaid her badge but later found it in her coat pocket.
Pro Tip 2/3Accidental Action
'Mislay' suggests losing something by mistake, not intentionally. 
Oops, I've mislaid my phone again; it must be somewhere around here.
Pro Tip 3/3No Blame
Using 'mislay' doesn't assign blame to someone for the lost item. 
I may have mislaid my keys — no accusing fingers should be pointed.