Smells after washing machine visit after plastered plastic, wiping water cover missing

Hello! Engine: 1.6 16V 81kW Was a bit on the road earlier (a couple of times a few km short distance). At the end I am to the washing machine. I wg. the of course not so incredibly fast handling of the queue repeatedly turned off and on again. Then car at home in the garage parked (passed in forward) and unloaded. I smelled a plastic mortise smell, but without looking back on my load (used petrol engine saw). About 1h later my parents were rn wg. something else in my garage -> plastic-mort smell! So I had taken long enough to unload before the gate was closed (back flap was open all the time), i.e. if it was the load, it would have had to have actually long gone. In the engine room I could not locate the smell. I only noticed that the wiper water cover was missing. I had the last time at the end of last year open wg. wiper water. My but the lid really put on ha But could not find the lid today. 1. How likely is it that the lid e.g. wg. overpressure around wiping water container disappears? 2. How likely is it that the lid e.g. wg. more shocks like driving through a pothole disappears? 3. Does jmd. know the favorite hides of runaway wiping water lids that wanted to warm up? 4. Did not find a suitable spare part at Amazon, Daparto, automotive parts24 and Renet. So to Renault? Cost factor? Thank you! Noting PS: W itch jmd., why recently the rear window wipers in the washing system “Condome” get?