The purpose of such rules of thumb of burning or breaking up religious articles is to avoid the disconcerting and maybe even scandalous situation of people seeing a religious article on top of a trash heap and thinking a sacrilege has taken place.
And so, burning suffices to prevent that from happening. Or, breaking things down and disassembling them and then burying them or, if you’re citified cement-locked, in the trash. The point is to make them no longer recognizable as a religious symbol.
But that’s religious articles which are recognizable as a religious symbol. What about ordinary items that are blessed such as plain candles or advent wreaths? Well, as long as it’s disassembled and no longer an Advent Wreath, then toss it. Nature is already destroying the wreath anyway. Nobody’s going to know that some candle nubs have been blessed at one time.
Non-religious items that are blessed aren’t in the same category as blessed items. If a priest goes out and blesses all the cars in the parish parking lot, does that mean no one can sell them? Or if they’re worn out, take them to the dump? Can no one sell a blessed house because it’s blessed? Blessed ordinary items are treated differently than religious articles which are treated differently than sacred vessels. They have a hierarchy of care with regard to disposal.