You can replace your lost i94 card. look for futher information in this website
http://www.path2usa.com/immigration/relatedinfo/i94card.htm

If you return before lenght to stay in USA that issue at airport, for B1 n B2 visa usually they issue you stay up to 6 month maximun and minimum 3 month, If you return before that then there no problem, chao

There is an application fee of 320 dollars for replacement. But if I do not report it to USCIS and if I can provide them the proof of leaving the US and "not overstaying", do you think there might be a problem the next time I re-enter US? Anybody please help.

THANKS

THANKS A LOT PREMLAMA!

You brought me a relief. Do you think they never issued me one ...Coz..I do not remember losing any documents? Is that how it works for all B1/ B2 visas?

This is the first time I had visited US and I never dealt with situations like this before.

I-94 should be issued to anyone who enter USA legally. There is no away u can enter USA from POE without I-94 issuance for u. There should be stamp in yr passport for the duration u r given to stay in US. If u leave USA within the valid period, no more problem for u when u r coming again next time. BUT when u are going back to Nepal pls be in airport before time caz they may ask u I-94's details. U can shoe the VISA stamping so that they will be convinced and ease happens. POE will issue u new I-94 in yr next visit. For yr convenience u can talk to USCIS that u loose yr I-94 before u go back.

I have a stamp in my passport, which just indicates the arrival date at the POE but the stamp mentioning the duration of stay is nowhere to be found. I was issued a 6 months duration at the POE. the officer told me not to stay over 6 months. 

USA_Kathmandu friend, I have seen a case like yours. One of the person I  have known was here for tourist  visa and he did not have I 94. I did not hear anything from him so i guess it should be fine. To be sure check with anyone who has known the person in US with tourist visa.

thanks! to all of you guys..that was very helpful...please keep posting if you got more info..thanks