Oranges for 大吉大利 i guess. It is also common to 洒五谷on the floor.
Masking tape + marker to indicate the defects.
Level or dunno wat is this call where there are 3 water bubbles to measure the sockets are slanted or not.
You can borrow a pole with steel ball from bsc to knock on the tiles to chk for hollowness.
Happy key collection and door opening tomorrow!