Answer:
The manager 
xyz mall 
(area) 
(city). 
Sir, 
Sub-regarding loss of purse 
This is to bring to ur notice that I have lost my purse in ur mall. I left my purse at the shop around 4:00 pm on Saturday 8th November 2020. It was purple in color with A brand logo of GUCCI on it and has a credit card, photo ID, debit card, and some cash. 
Kindly look into this and please find my purse. I will be highly obliged. 
Thanking you 
Yours faithfully, 
(ur full name)
(your address) 
(your locality) 
(your city). 
(date).