Humidor Question

[Caymus]

When I was in college in 1988 or so, I bought a humidor and cigar sampler from Thompson, I believe. Throughout the years, my dad would give me cigars: La Gloria Cubana, Por Larranaga, some off-brands, etc. They sat in that table-top humidor for years. No humidification, no hygrometer, moved a dozen times, totally neglected it, thrown in a closet or garage, wherever.
About a year ago, I got into cigars. I now have 5 big humidors and 3 wine refrigerators that I use for cigars, with Heartfelt beads, digital hygrometers, etc. Yet that old cheap humidor has a smell that melts my knees. It smells so great...sweet, complex, intense. I've got my very best cigars in it (Padron anniversaries, Opus x, tatuaje miami, Oliva V etc) When I pull a cigar out of it, they smell amazing....just like the humidor itself. When I smoke an Oliva V from it, it has taken on the aroma from the humidor and I can taste and smell it with every puff...amazing. An Oliva V from it's own box doesn't smell or taste like that.
My other humidors just smell like cedar or the cigar itself. Is the other humidor so awesome because of age ? Because I had cigars in there for years without even opening it ? How can I get that "seasoning" in my other humidors....time?