You should contact OSH immediately to request that they re-issue this W-2.
You shouldn't file
your return without the W-2 you've lost.
First off, you need to wait for a new W-2 to arrive so that you can e-file. To file a return without your W-2, you have to complete Form 4852, Substitute Form for W-2, and you can't e-file this with your tax return.
Secondly, the information on pay stubs often doesn't correspond with what's on your W-2, so you could be entering incorrect information. This could not only affect the tax you pay, but any credits to which you might be entitled, as well.
You should contact OSH immediately to request that they re-issue this W-2.
You shouldn't file
your return without the W-2 you've lost.
First off, you need to wait for a new W-2 to arrive so that you can e-file. To file a return without your W-2, you have to complete Form 4852, Substitute Form for W-2, and you can't e-file this with your tax return.
Secondly, the information on pay stubs often doesn't correspond with what's on your W-2, so you could be entering incorrect information. This could not only affect the tax you pay, but any credits to which you might be entitled, as well.