You know this usually happens. You go to the lab and you don’t feeling like scanning all the negatives. When you go again to pick up the results you get upset. Just a few were saved. But shouldn’t be us who decides?
Some were taken with an Holga using 35mm film without back, others simply 120 films.
This is for beginners: when you take your films to the lab, check you have everything done. Sometimes they take the decision of killing your pictures!