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The bass is usually playing root notes or outlining chords so I find it's the best way to work out progressions. Once I know the chord structure I can see what key(s) the piece is in.
I strongly advice against playing high on the G string, trying to match notes one or two octaves lower. If the 'original' notes are in that register that's ok of course.
For one, many players that do that somehow tend to end up playing the 5th instead of the root. They find a note that goes well with the chord they are hearing, but in a high register that may well not be the root.
And secondly, it is really weird for a bass player to not be able to hear low notes. If that's an issue, more practise in hearing low is in order.
At the end of that, it should be very easy to pick up the bass and identify the key.