Lost very old I 20 and I 485 filing - Urgent

[idlidosa]

Hello All,

I came to US on student exchange program in 1999 and left the country in time. Later in 2004 i came back on F1 and moved to H1B. Currently i'm on H1b and need to file my I485.

I lost my first I 20 received in 1999. Also the university does not have the old record. I don't remember if i got I94. But after i left US i went to my Japan university and stayed in Japan for 5 years.

Do i need to mention the first US stay in my I485 filing. If yes then what alternative document should i use?

Please help.

Thank you