Stored summer tires disappeared from merchants. What to do?

Hello board, am new here. Last year I had my summer tires stored with my dealer for the first time in autumn (GTC 17″ rims). Last Friday I wanted to have my summer tires installed and take my winter tires right away because I will change the next weeks anyway. After the information that my front brake discs and brake blocks have to be renewed, I had it done. The company manager said that my set of summer ice creams would have disappeared without a trace. According to his statement from today’s noon, he would not have found a solution yet. He offered me to put similar rims on it now so that I don’t have to drive around with my winter tire until my rims are found. Now I have just thought that the car dealership might take a long time before I finally have my rims again. How long do you have to wait for a replacement or what kind of Mögl would be great if one of you could help me. Greetings