buyer says not recieved item from 10 days ago

[carlacutie696]

buyer message me today to say the package not received yet and  'when should they expect them'? seeing as xmas has just gone and most buyers want items before xmas i feel suspicious they not contacted me sooner about this like 'it hasnt arrived before xmas'  which is why i posted First Class.   same post office i usually use with no previous problems.

i posted late same day was sold and First Class on 18th december.   . now 28th.

my problem is i'v cleared out all my receipts drawer now assuming all my posted items had been received so i now have no proof of post.. 

personally i would not wait longer than 5 days to make contact had i not received an item, especially if 1st class post.

does this sound genuine ?

[ticklingstick-transport]

It will arrive, First Class letter  postmarked 19th received this morning.