Hi ewibit, 'just saw your question, sorry for the late reaction... And nope, I ran into problems when building the v2.5.2 .deb package and was feeling too much in a hurry for securing phase 1 to delay this any longer, 'did the first stage on my brother's Win10 machine  

'Just installed the v2.5.3 .deb package, 'went straightforward, it looks exactly like v2.5.2 to me, and there is no mention of a second (reveal) phase.
I ran the Reclaim Tool again in v2.5.3 with my old seed + a new seed I just made up, and it got confirmed. 'Pity that an old seed can be linked to several new seeds, even if only the first match should prevail. So we don't really know if our seed has been claimed by someone else previously...