[morzh]

Today a narrower flush cutters came, and I was able to take the smaller can out.

These are the tools I had to use in order to do it.

   

The flush cutters and the soldering iron allowed to separate the tab from the chassis and lift it a little.
The small chiesel allowed to lift it a bit more. 
The lady's foot allowed to bend it some more, though I had to use various angles as the foot itself was stomping on other things around or on an already unbent tab.
And eventually the pliers allowed me to grab the tabes, straighten them out, and the can came out.

This is what was left:

   

The can

   

Then I used a heatgun, corkscrew and a wood bar. I heated up  the can with the corkscrew in, then hung it between a large vise's grips by the corkscrew's handle and using the wood bar started pulling down on the can. The caps came out.
Only one half of the can was caps, the other just tar. I wonder if I should keep it; probably should.