I've lost him !!!
As I don't have a car for the moment, I had friends driving me. Upon returning home, he was sitting on the arm of the lady while her husband helped unpacking the litter-box, putting food in the bowls etc. When they left after half an hour, I took the kitty upstairs because he acted "sleepy" and I would like him to sleep next to my bed. After that, I went downstairs for a little snack. He was constantly meow-ing so I went up to get him. He was nowhere to be found. But once I was behind the PC again, he started meow-ing again. Going to have a look he ... well, I assume you get the drill. I guess that's why we take cats
, it's good for our fitness
Further observation: I've had a rough week cleaning up (a part of) my mess: collecting two months' worth of pizza boxes and softdrink-bottles, broken glasses and bottle caps and scraping dried up rotten fruit off the kitchen floor, just because I thought this was not a safe place for the little critter. Amazing that he gave me the motivation even before he arrived. And he already left a token of our friendship in the litterbox ...
PS: too bad they mixed up my order: I have babypowder-scented cat litter now (I did not even realize that was a thing) ... oh well, maybe it's a good starting point to learn to accept life as it comes.