Did Morel find back his pipe? As stated in the wiki,
It is unknown if Morel retrieved or replaced it afterwards.
Given where the manga is now, I doubt we'll see if he retrieved it soon since the focus is currently in the expedition to the Dark Continent and the succession war between the princes of the Kakin empire and as far as I know, he isn't in the expedition nor as one of the guards of the princes, unlike the other hunters.
If he didn't have his pipe, that mean he is useless, currently, right? I wouldn't assume that easily since he has other sets of abilities aside from those that requires the use of his giant pipe. Also, the pipe isn't anything special or that can only be made via certain means so he can easily find a replacement, or find the one who originally made his first pipe, although as to who made his pipe originally is currently also unknown.