Well Mr Leopard was absolutely right that one must submit forms in person and get the receipt but i can understand this is not the case with everyone as every one is not living in big towns
@ mhovaida, if u used any good courier company like for example TCS, then u can get the tracking record from their website as to when they delivered the pack, and similarly the receipt signed by fpsc employee can be retrieved from courier company's record
but again as has already been mentioned that FPSC is not concerned with postal delays, it is entirely the responsibility of candidate

__________________
Dr. Hassan Mabroor