dont forget all pages of passport
That is important. even the blank pages. if you are on h1B then thats better (i think) than copies of your 140/485. i read on this forum that if you are only an adjustee, the visitor visa to parents wasnt given because apparently AOS wasnt proof enough (dont know how many cases this happened). If you are only an adjustee, then do the best with what you have. also might want to include plan of tourism in invitation letter and say in the affidavit that you will take care of all expenses like food, travel, lodging etc while they are here.
Good luck.