Considering the vast number of spells people have made, there is some possibility either way. Those ingredients are used in some love spells, though the rose color is more often supposed to be red or pink.
Does your colleague have a birthday soon or has had one recently? Is there any sort of gift giving event or holiday where you live near now? I'm just trying to find some logic for the gifting.
Considering it is from an admirer, I would not completely doubt if they are trying to not only pass along the remnants of casting a spell, but also have created some sort of charm bag.
If that is the case, it is likely no more than a hope for your colleague to become attracted to the admirer. But don't worry: Your colleague has free will, and can deny any magic sent their way. If your colleague does not want to be with the one who gave the items, then that's that, really.
However, if there is some concern about what energy was given, a simple banishing should be enough to rid it, as well as being rid of the gift -- whether just putting into the garbage (outside the home), putting it beneath running water, burying it off the property, etc., as may be seen fit.