For Royal Mail, check if the address is correct, if it's partially wrong, it could cause problems. If the address is correct, check if one of your neighbors picked up the package, if it is a workplace, check if someone else picked up the package. If the package still can't be found, send us an email with this information and we will contact RM to clarify the matter. For DPD, the procedure is similar - check the correctness of the address, check the photo of the moment of delivery, whether you recognize the place and contact us immediately.