Haven't heard a lot of chatter about this, but it sounds like we're still trying to confirm the location of the video. Whether, or not, this is crafty media promotion, or devastatingly creepier reality, here are my thoughts as someone who has a background in horticulture and forestry (I have studied the forests of the U.S., and have spent extended periods of time in wilderness across the country), and have spent time in the backcountry of E. Europe.

Although the background is grainy, and somewhat overexposed, it IS POSSIBLE that this was filmed in Poland (or, at least, Central to Eastern Europe), from which it is claimed to be mailed to Sweden. I am seeing the tell-tale fingerprint of a mixed coniferous/deciduous forest in the background. As of yet, we have no observable wildlife to ID, however, I am seeing tall, stringy/lanky coniferous branches easily blown by what appears to be a light breeze (these could be European Larch, and Fir, which tend to be sparser, and shed more needles than other conifers), with broader, stouter, yet sparse, swaying conifers (possibly Scot's and Bosnian pine). Light is still shining through the canopy, revealing deciduous trees w/out their leaves (all are tall, and thin, very much looking like birch and beech).

All aforementioned species are common to Poland, and oftentimes found in the same stand of vegetation. It is difficult for me to make out ground detritus. As I understand, this video originally surfaced in May 2015, if so, it is possible that it may have been filmed in Fall (maybe, 2014?), or early- mid- Spring (maybe, 2015?), hence, no/few deciduous leaves. Eastern Europe did experience a late Spring in 2015, so deciduous leaves may not have appeared in this area as late as May. No, I'm not saying this IS a forest in Poland, but it is most certainly not out of the question. If someone is seeing something else entirely, please lend your thoughts, would be good to dig deeper...