I was born in Yugoslavia.
Started collecting comic books very early. Meaning I would have a stash I used to trade with friends and many more that I wouldn't give to anyone.
There were no bags or boards but I kept them flat and facing each other with stapes at the opposite end.
Once the war started I had to leave them all behind.
From the place that traditionally was not a collector's market, you can't even find those books anymore. Just imagine how cool it is that they said Comic Book or Magazine from Jugoslavija. A lost civilization like Mayan's.
I was collecting:
Eks Almanah
Magazine mostly B&W. Jugoslavija, despite being a Communist country at the time, was perhaps the only regime of its kind that allowed comic books from the west. This Magazine had a wide variety. Batman, Flash, Thor, Tarzan, Spiderman, Hulk, Dracula, Umpah-pah, Phantom, Aster Blistok, Mandrak the magician, Flash Gordon, and few original Yu-Comic Book characters like Herlock Sholmes, Bili The Pluc etc.
Stripoteka
Magazine B&W. For a more mature audience. Rip Kirby, Modesty Blaise, Blueberry, AXA, Prince Valiant, Coco-Bill, Spider etc. I ended up reacquiring a few of these but not even close to what I used to have.
Alan Ford
B&W pocket-size Comic Books created in Italy. This is the only one I was able to replace completely with issues I used to have and then some, in newly printed hardcovers. However, the first prints would probably have me set for life by now.
And my absolute favorite:
Strip 81 /82 / 83
The dimensions of this Comic Book flip Rock Music magazine was something I never have seen before or after. It was a mixed bag of Marvel, DC reprints as well as European titles. And when you flipped them, it was a Magazine talking about the current Rock music scene. Later I was able to buy a few issues, but they are all in fair to poor condition.
This is only the ones I regret leaving behind every day, but my collection was substantial with other titles as well, and no chance of ever replacing them.