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Assuming they didn't mess with any of the adjustment points on the pieces that had to be moved out of the way to get the hub off, no you should not need any alignment since everything gets put right back in the same place.
As long as they didn't change the setting on the LCA front cam and the tie rod adjustment there is no need to do an alignment unless it needed one anyway. Then it would be on your nickel.
There's no reason to change any allignment settings when R n R the rear hub. Hub/wheel bearing is one piece. Just have to remove rotor/calliper to replace the hub. Now if you bent the wheel bearing from hitting a curb hard enough then you might need a rear allignment.
Nothing bent, just a bearing that went bad. The dealership did the replacement very quickly, so I'm gonna guess they didn't change any settings and skip the rear alignment. Thanks all for the replies.