for safe, the answer is from 张哲瑞联合律师事务所web

I-485 常见问题及解答:

2. I-485申请中哪些文件需要原始件?
只有体检报告和你的照片要原始件。

所有跟帖: 

My employment verification letter is also original -usedtobeadoctor- 给 usedtobeadoctor 发送悄悄话 (0 bytes) () 06/30/2007 postreply 14:48:06

needless to say your signature pages of forms -gc2020- 给 gc2020 发送悄悄话 (0 bytes) () 06/30/2007 postreply 14:55:04

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