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Most wood shavings here are pine, I haven't come across any fir not that I've looked at that many but the main thing to look for is kiln dried which is what usually makes wood shavings safe for hamsters.
Do you have any paper based substrates there? They are generally a safer option if you aren't sure about the wood.

ETA I think we posted at the same time, paper shouldn't get smelly, hams are very clean really, usually pee in one spot once they've settled in so spot cleaning is easy & the cage shouldn't smell at all.