Parcel mystery

Got home this evening to find this note from the postman. Do you have any idea what it might say, other than that the postman is called Robert? I can’t find a parcel anywhere - been round several neighbours, looked in the garden, plant pots, dustbins, even the gas meter box! I’ll have to go to the sorting office and ask unless I can catch the postman in his rounds tomorrow. I’m not expecting a parcel so I’m a bit confused all round!