FINDING OUT IF YOUR MOTOR IS CHIPPED?

[Orange rover]

Howdo all
how can i find out if my motor is already chipped?
If mr blogg's preformance guy! plug's his laptop in to reprogram the ecu will it tell him if the ecu has already been tweeked or not.
You're all gonna say now don't you know if your motor run's better already! well no. landy's n other motor's i know how well or NOT they preform lol.
The motor in question is a ssangyong rexton. it has all merc running gear (same as the sprinter vans).At the mo. it goes like sh@t off a shovel n pulls Orange rover all day long.
So i don't want to pay out any money or be conned for work that may have already been done.
cheers for any help martin.

[Orange rover]

Someone asked why you want to chip it if it's running fine at the mo?
well curious really n if it is it's a plus point if i decide to sell it.
cheers martin