I would suggest you purchase its service manual and locate those screws accordingly using the service manual.
To purchase the service manual, contact Sony DAPC.
or you could confer with a Sony DAPC service agent if the following DSC-T1 part numbers fits your need:
Part # 308615611, Description: SCREW B1.2
Part # 308615621, Description: SCREW B1.2
Part # 308621801, Description: SCREW(M1.4),LOCK ASE,SPEC