stupid ty question

so in you ty cards, you're supposed to thank the guests for their generous gift and then mention what it will be used for..

ok, so if everyone gave you cash, what do you say? obviously all diff. amts, but say average of $100 to $200 gifts... what do you say? like, oh we can't wait to put it towards our cc bills? ok, just kidding, but seriously, do you make something up? or since its been 6 months do you say we used it to buy xyz? or towards something? or we spent it on the hm?

help! do we havvvve to say what we used it for? i feel like if we say we used it for something specific some guests could be llike, oh they used it for THAT? ugh, help por favor