I lost my phone at school. I ask the lost and found attendant if she's seen it. She asks me when did I lose it. I say: I don't remember. Maybe a week ago, but it could've been more than a week. OR I don't remember. Maybe a week ago, but...

I lost my phone at school. I ask the lost and found attendant if she's seen it. She asks me when did I lose it. I say:

I don't remember. Maybe a week ago, but it could've been more than a week.

OR

I don't remember. Maybe a week ago, but it could be more than a week.