The easiest way is make note of how many of the item your selling. Example: if you were selling 1 wooden plank for 1 rupee and in the chest there was 45 wooden planks and if you checked your chest the next day and there were 44 wooden planks it means theyve bought one but to check theyve payed type /rupees in the chat box and make sure you have one more rupee then yesterday since the planks where 1 rupee.
