good luck in yourn 400 filing. 
I was on non-immigrant status and applied GC. At the end, my case was used CP in my home country. so when i returned back to US after my international project in oversea, I enterred to US with immgrant status and they stamped the date on my passport. luckily the stamp matches with the date on my GC. no i-485 confusion to me
I was on non-immigrant status and applied GC. At the end, my case was used CP in my home country. so when i returned back to US after my international project in oversea, I enterred to US with immgrant status and they stamped the date on my passport. luckily the stamp matches with the date on my GC. no i-485 confusion to me