Phone is back. it is the same phone - repaired.
They've changed the display assembly and a lot of other small accessories (probably damaged during dismantling the phone).
On the paper it is also stated that they tested the unit for water resistance (after being repaired) and it passed.
The screen is slightly misaligned but I will just close an eye on this.
Z1 compact - Stock
Nexus 4 - 16GB - Stock 4.4.2 + xposed
LG G Pad 8.3 - Stock + xposed
In-house: Nexus 7 - 32GB - (Stock 4.4.2 - rooted), RAZR i (stock 4.1.2 - rooted), Defy (MIUI) + Galaxy Tab 8.9 (ICS stock- rooted)