Down the Shute

I went over to Rhona's and then Angela arrovef
We went for a walk round the Heritage Loch. This is magnus coming down the shute.
Funny thing happened last night
I noticed this thing on the floor beside my suitcase which I am using as a table at the side of the bed. I picked it up and it was a set of car keys but we don't know how they got there as they don't belong to any of us. We asked the two electricians and the plumber who have been in the house recently but they don't belong to them. How did they get there?