Okay I've searched around seeing if this was even possible. Kyron was 3ft 8" and weighed 50lbs.
The above stroller could easily accomaodate Kyron's size and weight. The seat lays back making even more room for lenth[his small frame could easily be put in a semi-fetal position](thats hard to even think of)
But the weight limit on this specific stroller is 55-60lbs. So with a similar stroller and a blanket or medium duffle bag[Kyron in the duffle bag and then the duffle bag put into the stroller]as Ive seen lots of parents use the stroller to haul their bags around and carry the toddler. There are even larger, sturdier stroller with weight limits up to 120lbs. But wanted to show that it was possible with just an average sized and priced stroller..
All in all IT IS POSSIBLE. Tho, I personally do not believe this is how Kyron was removed.[I believe they hid within plain sight].. But it is possible.