Ma version

def detect_order_name2(message):
 text = message["subject"] + message["data"]
 order_name = list()
 lstr_order_name = re.findall(r"\d+", text)
 lint_order_name = [int(x) for x in lstr_order_name]
 for num in lint_order_name :
 if num < 60000 and num > 1000:
 order_name.append(num)
 print(order_name)
 if order_name :
 return order_name
 else :
 return "not_found"

Ainsi, si

message = {'subject' : 'toe 23 la 7777u tous 5555. 6666', 'autre': '9999', 'data' : 'pold zur 4555 3456 1234567 tr'}

Alors, cela renvoie :

[7777, 5555, 6666, 4555, 3456]

Après, on peut rendre plus pythonique mon code.