iserith
Magic Wordsmith
I think Detect Magic is still immensly helpful because it would give players the hint that a magic items is nearby. My group rarely uses it, but one time they used it and didn't leave the dungeon until it no longer detected anything magical.
According to magic item description you won't notice it by just looking at it, you need to handle it.
And I don't mind giving hints, hints can be great, but they can't be obvious. For example if I never describe what the corpses are wearing and then I suddenly say "He has a nice pair of boots" there is ZERO chance that they don't investigate them. So it's not really a challenge.
It's a challenge if they can succeed or fail based on their decisions - it's just not very difficult as you frame it. To be fair, I'm not sure how much difficulty you can wring out of such a situation or if it's worth worrying about it. It's still a challenge though since there is some chance the players do not choose to examine the corpse for loot, even if it approaches zero in your experience. That you believe there is zero chance they fail to investigate the corpse given hints could suggest that your description of the environment is lacking in some way since the corpse description "stands out" so much. This is something you could address and improve with little effort.