Where did these come from?

[rfman]

I recently removed the dashboard, steering, pedals and electrics inc. the BSI unit, in order to repair corrosion at the bulkhead. I wasn't able to remove the heater box because the air conditioning was still charged and instead worked around it. After rebuilding everything, I was left with these three screws and I don't know where they came from. I'm very careful when I remove that I put them together or refit them where they were removed from. These screws were on their own on the passenger side floor and I don't know where they came from. Can anyone help?