According to ShortNames.com, prices for 5 digit .com domains may have climbed noticeably over resistance in the past week. For the last couple years the floor price for these domains has hovered under $400, frequently touching this resistance but never really rising above. But just looking at the recent chart, this may have changed.
Here are the past sales as reported on ShortNames, which seems to signal a possible floor for these domains at around $500:
10028.com auction $10,028 3/6/2018 Namejet
13442.com auction $550 3/6/2018 Namejet
14055.com auction $1,413 3/6/2018 Namejet
13782.com auction $1,500 3/6/2018 Namejet
34958.com auction $500 3/6/2018 Namejet
54560.com auction $580 3/6/2018 Namejet
60504.com auction $500 3/6/2018 Namejet
67330.com auction $1,000 3/6/2018 Namejet
76640.com auction $560 3/6/2018 Namejet
77483.com auction $600 3/6/2018 Namejet
80544.com auction $760 3/6/2018 Namejet
84520.com auction $500 3/6/2018 Namejet
94660.com auction $550 3/6/2018 Namejet
42020.com auction $1,720 3/6/2018 DropCatch
42030.com auction $796 3/6/2018 Godaddy
20635.com auction $800 3/5/2018 Namejet
15089.com auction $800 3/5/2018 Namejet
29924.com auction $550 3/5/2018 Namejet
47727.com auction $560 3/5/2018 Namejet
52242.com auction $550 3/5/2018 Namejet
52349.com auction $721 3/5/2018 Namejet
71019.com auction $800 3/5/2018 Namejet
63443.com auction $560 3/5/2018 Namejet
87125.com auction $1,500 3/5/2018 Namejet
However, it may just be that the quality of names on auction has been fairly high as of late, and this might just be a blip on the charts if we wait a while.
It should be noted that there's one (not so pretty) 5n sitting for a fixed price of $388 at Godaddy with no takers as of yet. The domain is 54790.com. So maybe don't call a $400 floor just yet.
Will be monitoring in the coming weeks to see if there is a prolonged rise in the baseline price for 5n.com domains. Stay tuned.