This being a bit light for a fan also expect 8 32 or 10 32.
Ceiling fan mounting box screws.
I would use 10 32 screws about 3 4 longer than the depth of the box so 2 5 or 3 long and screw them into the holes in the back of the box that lie behind the cover plate mounting ears they need to engage into the hanger bar behind the box in order to mount the fan correctly it appears in your case.
Most building codes require ceiling fans to be mounted on special fan rated boxes which are made of metal or strong plastic and have deep threaded holes for the mounting screws.
Replacing a ceiling box is a messy job.
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4 2 out of 5 stars 78.
The box must be mounted firmly either by attaching it directly to a framing member or by using a fan rated brace.
Either way the front edge of the box should emerge through the ceiling flush.
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Ground screws are 10 32.