From a now defunct website listing the losses of the Soviet Northern Fleet Aviation, I have the following Hampden losses by 24 MTAP/9 GMTAP:
01 Nov 42: one Hampden crashed at Vaenga-1 airfield, no casualty reported
18 Nov 42: one Hampden crashed at Vaenga-1 airfield, one KIFA
21 Dec 42: one Hampden crashed, crew wounded
01 Jan 43: one Hampden crashed in the sea near Vardo, 4 KIA
12 Jan 43: one Hampden did not return from a mission, 4 KIA
14 Jan 43: one Hampden shot down in the sea, 4 KIA
29 Jan 43: one Hampden shot down over a convoy (4 KIA) and another damaged and forcelanded on Rybachy peninsula, 1 WIA
31 Jan 43: one Hampden shot down, 4 KIA
10 Apr 43: one Hampden shot down by a Bf 110 over the Tana Fjord, 4 KIA
25 Apr 43: one Hampden shot down, 4 KIA
02 May 43: one Hampden shot down, 4 KIA
08 May 43: one Hampden shot down, 4 KIA
02 Jun 43: one Hampden crashed near Vaenga, 3 KIFA, 1 WIFA
23 Jun 43: one Hampden shot down in Pummanki area, crew safe
04 Jul 43: two Hampdens shot down by 70°08 N 30°40 E, crews safe
We have 17 entries for the 20 Hampdens transferred to Soviet control.
But please note differences with the long text by Mr Geust above. For example, he had four accidents (two Hampden destroyed and two damaged) during the training in 1942, while there are 3 entries above, and he says that on 21 Dec 1942 the CO of 24 MTAP, Lt.Col. Vedmedenko, who was killed.
I would rather believe Mr Geust than me, but in this case he seems to be wrong: various Russian sites says that that Vedmedenko took command of 24 MTAP on 20 Dec 42 and was killed on 16 Mar 43 (no Hampden loss this day, but a DB-3, also used by the regiment, was lost, 1 KIA).
And this date is confirmed on the OBD Memorial for Soviet WWII dead:
http://www.obd-memorial.ru/html/info.htm?id=76521463