Where can I find my ITIN number on the net. I haven't used it in the past four years and I'm now living outside the u.s. but I need it to access to some records?

If you have NOT used it in four years, it is probably expired and may have been re-issued.

You can contact the IRS and request that they send you a copy of the original ITIN letter, assuming that the ITIN is still valid.

I have missed placed my tax id form, where can I get a copy?

If you speak of your ITIN letter, you can call the ITIN processing center at Austin, Texas at 1-800-908-9982 and request a replacement letter.