What I just did as the final fix

lead_fix.py

# STEP 1 REMOTE
import datetime
before = datetime.date(2018, 5, 15)
after = datetime.date(2018, 5, 1)
from shelby.models import Lead
qs = Lead.objects.filter(created_on__date__lt=before, created_on__date__gte=after, status=Lead.STATUS_NEW).values_list('id', flat=True)
for lead_id in qs:
	print(lead_id)  # copy that output into "new_leads.txt"



# STEP 2 - LOCAL w/ 5/15 1am backup db
from shelby.models import Lead

def fmtdate(d):
	return d.isoformat() if d else 'None'

f = open('new_leads.txt', 'r')  # open the leads from prod that are new
output = open('output_leads.txt', 'w')
lines = f.readlines()
for lead_id in lines:
	lead = Lead.objects.get(id=lead_id)  # look at 5/15 1am backup data
	if lead.status != lead.STATUS_NEW:
		line = "'{}^{}^{}^{}^{}^{}',\n".format(lead.id, lead.status, fmtdate(lead.reviewed_on), fmtdate(lead.bad_on), fmtdate(lead.na_on), fmtdate(lead.inactive_on))
		foo = output.write(line)


f.close()
output.close()



# STEP 3 - PROD REMOTE
lines = [
  # paste the contents of output.txt here
]
from shelby.models import Lead
import dateutil.parser

for line in lines:
	data = line.split('^')
	lead_id = data[0]
	status = data[1]
	reviewed_on = data[2]
	bad_on = data[3]
	na_on = data[4]
	inactive_on = data[5]
	lead = Lead.objects.get(id=lead_id)
	lead.status = status
	if reviewed_on != 'None':
		lead.reviewed_on = dateutil.parser.parse(reviewed_on)
	if bad_on != 'None':
		lead.bad_on = dateutil.parser.parse(bad_on)
	if na_on != 'None':
		lead.na_on = dateutil.parser.parse(na_on)
	if inactive_on != 'None':
		lead.inactive_on = dateutil.parser.parse(inactive_on)
	lead.save()