Most (good) alignment places keep the printouts from machine for a period of time - between 1 and 6 months, so they have proof if customer demands it. If they don't - tells something about them already.

 

it wouldnt be on the reciept itself, they should of given you a seperate print out along with the reciept that shows the specs. if they didnt, id call and ask them about it. just say your car is still pulling and you didnt receive a spec sheet when you paid and your curious what the old specs were vs the new specs.