If the test didn't mention any contaminant I'd presume they are not contaminated. Personally I would try a few. Bromozolam is an analogue of Aprazolam.
And if you like Alprazolam chances are you'd like Bromozolam. I really don't understand why some people have a problem with this. It makes absolutely no sense to me. Apart from the not getting what you ordered angle. (This isn't aimed at you in particular, it's a general comment about my observations)
Just because a benzo is a 'designer benzo', or analogue of something else, that doesn't necessarily mean its a bad thing. (Although it truly was in the case of Diclazepam, the designer analogue of diazepam. I really disliked that, made me feel very 'out of it', definitely not in a good way, lethargic and brain fogged, although it did have a modicum of effect on anxiety. Many people seemed to feel the same way about it. However, many of the designer benzos that emerged during the legal high era, were fantastic products. Pyrazolam and Etizolam were the pick of the bunch in my opinion. Pyrazolam was amazingly good for anxiety, and very light on the 'hypnotic', sleep inducing effects, but sadly it does not seem to available on clearnet sites and has returned to obscurity.
There's a lot of myths being peddled about things like Etizolam, saying that its not medically tested etc. this is misinformation. It was patented in 1972 and approved for medical use in 1983.
Wikipedia doesnt state whether bromozolam has been medically tested, so possibly it hasnt been. If you cant get a refund or replacement I would definitely still try them though.