This stuff happens with all couriers, unfortunately. Some might be better then others in some locations. Also, there is a difference in service for DHL (= German postal system, like USPS, Canada Post etc) vs. DHL Express (comparable to UPS, Fedex, etc).
And another anecdote: In December my girlfriend bought online a new phone. UPS didn't reach us, so they brought it to a pick-up point a few streets away, which is a small corner shop. Tracking showed at the same evening a signature from this shop's employee, and ready for pickup. So far so normal.
When I went there one or two days later, they didn't find the package (Black Friday and pre-holidays mess with many packages). I complained to UPS and went again 1-2 days later. It didn't show up. The sender, the phone company's phone first line support people had no glue how shipping works and said we should contact the police, and tracking would say it was delivered (but that was just the signature of the UPS shop, not us). Of course usually the sender has to handle these problems, but calling them every day, they were just useless.
In between the UPS/corner shop (I never met the person who signed, of course it might have been a bulk signature for 20 packages and he never actually received it, but spoke only to his colleagues and the boss) told us they would have checked their security camera footage and they saw how our package was picked up by a woman, and she did ID herself. Of course you can see on a security camera a package's tracking number and a name on an ID card perfectly, using AI video enhancement and whatever crazy stuff a small corner shop runs. So, also from this end no help and just crazy things.
In the end I filed a missing package report with UPS (their help line was supportive and professional, the opposite of the sender's), and after the investigation was over after 10 days or so, UPS declared it as lost. We contacted the sender again, and somehow managed to escalate this time the call to someone who actually understands things (before even the higher support level was useless), and she arranged that my girlfriend could immediately pick up an hour later a phone from their shop, and upgraded her phone to a newer model (Pixel 8 instead of the ordered 7) without any additional fees. So, finally all good.
And what happened 2 weeks after that: We received by Fedex (not UPS this time) a new phone (Pixel 7), which I guess was shipped automatically a few days after they processed the package lost information. We contacted the sender, and they just told us: we are not the right department, you have to call the other department. Ok, we sent them an email, and never heard back. I guess they don't remember by now and we should sell this one...