Thing
My advice and it is worth every penny you paid
is to go to your club manager and say that you are concerned that that the weight of this aircraft seems unusually low compared to every other similar aircraft and that you think it should be reweighed.
If the answer is no then I would use the Cessna Sample empty weight, 1238lbs in my flight planning. Low powered light aircraft like the C 152 will be disproportionately effected by flying overweight and so care should be taken not to allow the already meager performance margins to be reduced.